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Two new contingency sites have been added and approved by the Integrated Ocean Drilling Program Environmental Pollution and Safety Panel and Site Survey Panel based on
Proposed contingency Sites NT2-05A and NT2-10A are located on the trench slope, between proposed Sites NT2-01D and NT1-03B (Table T1). The details of these sites are as follows:
Both sites are available for contingency operations for both logging-while-drilling (LWD) and coring/measurement operations using the hydraulic piston corning system. The scientific significance of the new contingency sites is related to the recognition that significant amounts of material shed from uplifted thrust blocks transported to the surface by faulting on the megasplay system have been deposited on older thrust blocks downslope toward the trench. Cores taken in these sedimentary packages may reveal the timing and relative age of past fault motions through the identification of provenance and age of deposited material and the age across any disconformities between newly deposited sediments and older uplifted fault blocks.
Proposed Site NT2-01B, scheduled for LWD, coring, and casing operations during Expeditions 314 and 316, has been relocated based on refined processing and interpretation of the 3-D seismic data. The new proposed Site NT2-01D (Figs. F4, F5) has the same scientific targets, target depths, and proposed drilling program and is located at 33°13.398′N, 136°42.140′E at a water depth of 2346 m and proposed total depth of 1000 mbsf (Table T1).